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Associated Press
Tagged cattle are gathered at Larson Farms/Midwest Feeders, one of the largest ranches in Illinois, Wednesday, April 25, 2012, in Maple Park, Ill. Owner Mike Martz, who raises 6,000 cattle a year, says the USDA system is working and that the discovery of mad cow disease in a lone cow in California is a prime example. (AP Photo/Charles Osgood)

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